Wanted to share something I found out about today when I was troubleshooting Jellyfin, hopefully it will help people out. Jellyfin wouldn’t connect when I had LAN Connections enabled on ProtonVPN, so I contacted support. They let me know that having Kill Switch enabled with LAN connection is incompatible:

"…the Killswitch and Allow LAN connections features are mutually exclusive due to their functionality differences, you will be unable to utilize both of them at the same time.

Unfortunately, due to compatibility issues within these features and some users experiencing issues when utilizing both of them, our team decided to make them mutually exclusive, therefore, at this moment you will not be able to utilize the Killswitch feature and have access to your LAN, therefore, if you wish to have access to your LAN, we suggest you keep the Killswitch feature disabled."

Not sure I understand how the two settings are related, but good to know! Another note is that Split Tunneling had no effect on this, so clearly Kill Switch also effects apps that are excluded in split tunneling also.

our team decided to make them mutually exclusive, therefore, at this moment you will not be able to utilize the Killswitch feature and have access to your LAN

Yeah, I got the same reason when I asked about that issue with Android (GrapheneOS). I didn’t run into this issue on Windows. I don’t recall Mullvad running into this issue, either.

ProtonVPN has also been the only known app impacting GrapheneOS shipping a DNS leak fix due to “Proton is doing something weird” that other apps aren’t doing. Proton is also convinced they’re programing their app correct and aren’t open to fixing it…whereas Mullvad did when prompted.

Lastly…if the Killswitch and LAN access are mutually exclusive, why does Proton let me turn both on and not explain it? You’d think if you turned on the Killswitch, it would grey out the LAN access with a note saying you can’t have both. And if you try to turn on the LAN access with Killswitch on? It should pop up with a notification saying you can’t have both with a yes/no prompt to take you to the Killswitch settings to turn that off if desired.

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Graphene here as well! I gave them that feedback in the support email chain… no reason to allow this setting combo without a warning. Also not clear why split tunnel doesn’t remedy this, I would have thought apps excluded via split tunnel would be exempt from the VPN while it is connected and Kill switch is active (although obviously it makes sense that nothing is excluded when kill switch activates on vpn disconnect)

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